_=geom:Polygon:srid=4326,id:int,x:Float,y:Float
grid.0=POLYGON((0 0, 0 1, 1 1, 1 0, 0 0))|0|0.5|0.5
grid.1=POLYGON((1 0, 1 1, 2 1, 2 0, 1 0))|1|1.5|0.5
grid.2=POLYGON((2 0, 2 1, 3 1, 3 0, 2 0))|2|2.5|0.5
